What does toner do for hair color?

A toner works with your hair color to make sure the result after dying your hair is one shade of color instead of a bunch of unwanted hues and colors. For instance, if you dye your hair blonde, without toner use, chances are it will be brassy and other undesirable colors.

Commonly, toner is used when you are lightening your hair. It is used to get rid of uneven color, brassy color, or it can also put pigment back into the hair to make it look more natural than just the straight bleached look.